[logback-user] Any way to use all syslog level with syslog appender?

Is there any way to use all syslog levels (see e.g. http://en.wikipedia.org/wiki/Syslog#Severity_levels) when using Syslog appender? I see the constants for them defined in: https://github.com/qos-ch/logback/blob/master/logback-core/src/main/java/ch/... but I don't see all of them used. Thanks, erik